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1 | /* |
2 | * Copyright (C) ST-Ericsson SA 2011-2013 | |
3 | * | |
4 | * License Terms: GNU General Public License v2 | |
5 | * | |
6 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson | |
7 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/miscdevice.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/uaccess.h> | |
18 | #include <linux/watchdog.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/platform_data/ux500_wdt.h> | |
21 | ||
22 | #include <linux/mfd/dbx500-prcmu.h> | |
23 | ||
24 | #define WATCHDOG_TIMEOUT 600 /* 10 minutes */ | |
25 | ||
26 | #define WATCHDOG_MIN 0 | |
27 | #define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */ | |
28 | #define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */ | |
29 | ||
30 | static unsigned int timeout = WATCHDOG_TIMEOUT; | |
31 | module_param(timeout, uint, 0); | |
32 | MODULE_PARM_DESC(timeout, | |
33 | "Watchdog timeout in seconds. default=" | |
34 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); | |
35 | ||
36 | static bool nowayout = WATCHDOG_NOWAYOUT; | |
37 | module_param(nowayout, bool, 0); | |
38 | MODULE_PARM_DESC(nowayout, | |
39 | "Watchdog cannot be stopped once started (default=" | |
40 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
41 | ||
42 | static int ux500_wdt_start(struct watchdog_device *wdd) | |
43 | { | |
44 | return prcmu_enable_a9wdog(PRCMU_WDOG_ALL); | |
45 | } | |
46 | ||
47 | static int ux500_wdt_stop(struct watchdog_device *wdd) | |
48 | { | |
49 | return prcmu_disable_a9wdog(PRCMU_WDOG_ALL); | |
50 | } | |
51 | ||
52 | static int ux500_wdt_keepalive(struct watchdog_device *wdd) | |
53 | { | |
54 | return prcmu_kick_a9wdog(PRCMU_WDOG_ALL); | |
55 | } | |
56 | ||
57 | static int ux500_wdt_set_timeout(struct watchdog_device *wdd, | |
58 | unsigned int timeout) | |
59 | { | |
60 | ux500_wdt_stop(wdd); | |
61 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
62 | ux500_wdt_start(wdd); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static const struct watchdog_info ux500_wdt_info = { | |
68 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, | |
69 | .identity = "Ux500 WDT", | |
70 | .firmware_version = 1, | |
71 | }; | |
72 | ||
73 | static const struct watchdog_ops ux500_wdt_ops = { | |
74 | .owner = THIS_MODULE, | |
75 | .start = ux500_wdt_start, | |
76 | .stop = ux500_wdt_stop, | |
77 | .ping = ux500_wdt_keepalive, | |
78 | .set_timeout = ux500_wdt_set_timeout, | |
79 | }; | |
80 | ||
81 | static struct watchdog_device ux500_wdt = { | |
82 | .info = &ux500_wdt_info, | |
83 | .ops = &ux500_wdt_ops, | |
84 | .min_timeout = WATCHDOG_MIN, | |
85 | .max_timeout = WATCHDOG_MAX32, | |
86 | }; | |
87 | ||
88 | static int ux500_wdt_probe(struct platform_device *pdev) | |
89 | { | |
90 | int ret; | |
91 | struct ux500_wdt_data *pdata = pdev->dev.platform_data; | |
92 | ||
93 | if (pdata) { | |
94 | if (pdata->timeout > 0) | |
95 | timeout = pdata->timeout; | |
96 | if (pdata->has_28_bits_resolution) | |
97 | ux500_wdt.max_timeout = WATCHDOG_MAX28; | |
98 | } | |
99 | ||
100 | watchdog_set_nowayout(&ux500_wdt, nowayout); | |
101 | ||
102 | /* disable auto off on sleep */ | |
103 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
104 | ||
105 | /* set HW initial value */ | |
106 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
107 | ||
108 | ret = watchdog_register_device(&ux500_wdt); | |
109 | if (ret) | |
110 | return ret; | |
111 | ||
112 | dev_info(&pdev->dev, "initialized\n"); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int ux500_wdt_remove(struct platform_device *dev) | |
118 | { | |
119 | watchdog_unregister_device(&ux500_wdt); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_PM | |
125 | static int ux500_wdt_suspend(struct platform_device *pdev, | |
126 | pm_message_t state) | |
127 | { | |
128 | if (watchdog_active(&ux500_wdt)) { | |
129 | ux500_wdt_stop(&ux500_wdt); | |
130 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true); | |
131 | ||
132 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
133 | ux500_wdt_start(&ux500_wdt); | |
134 | } | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int ux500_wdt_resume(struct platform_device *pdev) | |
139 | { | |
140 | if (watchdog_active(&ux500_wdt)) { | |
141 | ux500_wdt_stop(&ux500_wdt); | |
142 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
143 | ||
144 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
145 | ux500_wdt_start(&ux500_wdt); | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | #else | |
150 | #define ux500_wdt_suspend NULL | |
151 | #define ux500_wdt_resume NULL | |
152 | #endif | |
153 | ||
154 | static struct platform_driver ux500_wdt_driver = { | |
155 | .probe = ux500_wdt_probe, | |
156 | .remove = ux500_wdt_remove, | |
157 | .suspend = ux500_wdt_suspend, | |
158 | .resume = ux500_wdt_resume, | |
159 | .driver = { | |
160 | .owner = THIS_MODULE, | |
161 | .name = "ux500_wdt", | |
162 | }, | |
163 | }; | |
164 | ||
165 | module_platform_driver(ux500_wdt_driver); | |
166 | ||
167 | MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>"); | |
168 | MODULE_DESCRIPTION("Ux500 Watchdog Driver"); | |
169 | MODULE_LICENSE("GPL"); | |
170 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
171 | MODULE_ALIAS("platform:ux500_wdt"); |